With a more polarised political spectrum it becomes more difficult, or practically impossible to create a coalition government. With more votes to the extreme left and right, the parties in the center are taking the blows.
This is not a bad thing for the representativeness of the political system. With votes evenly distributed over the political spectrum it is more likely that people feel properly represented. Good. It poses a problem for the creation of a government in the traditional way.
In the Netherlands a minority government was created in 2010 with support by one extreme party. This coalition was not stable and fell after two years.